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Goodwill (Tables)
6 Months Ended
Jun. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Summary of Changes in Carrying Amount of Goodwill
A summary of the changes in the carrying amount of goodwill, by operating segment, in the six months ended June 30, 2018, is shown below (in millions):
 
Seating
 
E-Systems
 
Total
Balance at January 1, 2018
$
1,274.4

 
$
126.9

 
$
1,401.3

Affiliate transaction

 
20.9

 
20.9

Foreign currency translation and other
(17.1
)
 
16.3

 
(0.8
)
Balance at June 30, 2018
$
1,257.3

 
$
164.1

 
$
1,421.4